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If you take a base backup from a standby server with "pg_basebackup -X fetch", and the timeline switches while the backup is being taken, the backup used to fail with an error "requested WAL segment %s has already been removed". This is because the server-side code that sends over the required WAL files would not construct the WAL filename with the correct timeline after a switch. Fix that by using readdir() to scan pg_xlog for all the WAL segments in the range, regardless of timeline. Also, include all timeline history files in the backup, if taken with "-X fetch". That fixes another related bug: If a timeline switch happened just before the backup was initiated in a standby, the WAL segment containing the initial checkpoint record contains WAL from the older timeline too. Recovery will not accept that without a timeline history file that lists the older timeline. Backpatch to 9.2. Versions prior to that were not affected as you could not take a base backup from a standby before 9.2.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.